It worked perfectly with UTF-8. I found unfortunelly another RSS file which has coding iso-8895-2 (http://wiadomosci.onet.pl/2,kategoria.rss)
I tried to change UTF-8 for iso-8895-2 in code from you:
<?php
header('Content-Type: text/html;charset=iso-8895-2');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8895-2" />
. . .
....and it didt work. I got my problem back.
Please, help me resolve this. I just dont know what to do.